Improvement in bronzing-machines



W,.& J. BRAIIDWOOD. momma-mourn.

Pate

2 Sheets-8heet 1.

nted June 19, 1877.

2 Sheets-Sheet 2'. W. & LBRAIDWOOD.

BRONZING-MACHINE.

No. 192,223. mm J'une19,1877.

N. FEIERS, FHOTO-LIITHOGRAFHER, WASHINGTON, C,

UNTTED STATES WILLIAM BRAIDWOOD, OF MOUNT VERNON, AND JOHN NEW YORK, N. Y.

PATENT OFFICE.

BRAIDWOOD, OF

IMPROVEMENT m BRONZING-MACHINES.

Specification forming part of Letters Patent No. 192,223, dated June 19, 1877 application filed April 12, 1877.

To all whom tt may concern Beit known that WB,WILLIAM BRAIDWOOD, of Mount Vernon, in the county of Westchester and State of New York, and JOHN BRAID- WOOD, of the city, county, and State of New York, have invented a new and useful Improvement in Bronzing-Machines, which improvement is fully set forth in the following specification, reference being had to the etc 3 plying the bronze to the freshly-printed sheet,

this apron being arranged in close proximity to the surface of the cylinder on suitable rollers, and being arranged to move in an opposite direction to the cylinder while it passes through a bronze-fountain, where its surface is coated with bronze-powder; and an endless ,wiping-apron of velvet, fur, or other similar material, for removing superfluous bronze from the bronzed sheet, this wiping'apron bei n g arranged in close proximity to the surfaceof the cylinder on suitable rollers, and being arranged to move in an opposite direction to the cylinder further, in combining with said sheet-carrying cylinder and with the wiping-apron a pressure-roller for discharging or withdrawing the bronzed sheet after it has been released by the gripers of the cylinder and has passed off of the wiping-apron; also,in providing thesheetcarrying cylinder with a longitudinal ridge on one edge of the recess in the cylinder containing the gripers, so that when the bronzed sheet isreleased by the gripers a tendency is given to the front end or edge of the sheet to turn outward or away from the cylinder, and

the sheet is delivered at the proper point, the liability of the adhering of the sheet to the surface of the cylinder being obviated; further, in combining with the sheet-carrying cylinder and its longitudinal ridge, a series of strippers, which are arranged in close proximity to the cylinder, while the longitudinal ridge has openings for the passage of these gstripp'ers, so that the latter catch under the ;front end or edge of the sheet, which is caused to turn'outward by the action of said ridge, fand bythismeans the effect of the ridge is increased, as will be hereinafter explained.

In the drawing, the letter A designates a- @frame, which forms the bearings for the sheet carrying cylinder B of our machine. This cyli inder B is provided with gripers G, which are iarrangedin a recess, a, and with the usual ffrneans' for operating the gripers.

The letter D designates an endless bronzing-apron, which is made of velvet, fur, or any other similar material, and which runs over rollers E E, having their bearings in the frame A. These rollers E E are placed in such a position relatively to the cylinder B that the ;bronzing-apron D is thereby brought in close proximity to the surface of the cylinder- B. Immediately beneath the lowermost roller E is placed a bronze-fountain, F, the bottom of which is preferably inclined, as shown, so that if this fountain is supplied with bronze-p0 wder it is thence taken up by the bronzi'ngapron D, the bronze powderhaviug a tendency to adhere to the surface of the apron. The

letter G designates an endless wiping-apron,

which, like the bronzing-apron D, is made of ivelvet, fur, or other similar material, and fWhiGh runs over rollers H H, having their ibearings in. the frame A. These rollers H H are also placed in such a position as to bring the wiping-apron G in close proximity to the surface of the cylinder B. I

The freshly-printed sheet to be brouzed is fed to the machine from a suitable table, I, and when it is caught by the gripers O and carried round the cylinder B its surface is bronzed by the bronzing-apron D, While the superfluous bronze, or that between the printed part of the sheet, is wiped off by the wipingapron G. The rollers of the bronzing-apron D,'as well as of the wiping-apron G, are

geared in such a way that both said aprons are caused to move in an opposite direction to the cylinder B, as indicated by arrows in Fig. l.

With the wiping-apron G is combined a rotary brush, J, by which the bronze is removed from.said apron.

The gripers O are so arranged as to release the bronzed sheet after its front end or edge has passed off of the wiping-apron G, and for the purpose of discharging or withdrawing the sheet after it has been thus released we make use of a pressure-roller, K, which is so arranged that it is in superficial contact with the surface of the cylinder B. By the action of this pressure-roller K the bronzed sheet is discharged or withdrawn, or, in other words,

' is carried forward to its point of delivery after it is released by the gripers (l, and passes off of the wiping-apron G. Said pressure-roller K is provided with elastic collars, (best seen in Fig. 2,) which bear against the surface of the cylinder B, and it is, moreover, mounted in yielding bearings 01.

The cylinder B is provided with a ridge, N, on the edge of its recess a, where the gripers O clamp the end or edge of the sheet of paper or other material to be bronzed, said ridge being made to extend the entire length of the cylinder. By this ridge N the sheet is caused to turn outward, or away from the cylinder B when it is released by the gripers O, or is prevented from adhering to the surface of the cylinder, which it is liable to do when the ridge is not used, and the sheet is delivered at the proper point.

Said ridge N may be made of any height best adapted to the work or the material to be bronzed.

The letter L designates what we term strippers, each consisting of a flat piece of metal or other material, and one end of which is secured to a cross-piece, e, of the machineframe, while their other end is left free. These strippers are bent in such a way that their free end'is in close proximity to the surface of the cylinder B, and at or near the delivery-point of the machine. Now, in case the sheet, whose front end or edge is turned outward by the ridge N, as before stated, fails to deliver itself, it is caught under its said front end or edge by the strippers L, and thereby delivered, the sheet being thereby stripped from the cylinder.

In order to permit the ridge N of the cylinder and the stripper L to pass each other, openings f are formed in said ridge at a point opposite to each of the strippers, (see Fig. 3,) of such a depth or level as to form a continuation of the surface of the cylinder.

It will be noticed that these openingsfnot only form a passage for the strippers L but also, facilitate the catching of said strippers under the edge of the sheet.

Between the bronzing-apron D and the wiping-apron G may, if desired, be interposed a finishing-brush, O, for the purpose of distributing the powder, which is applied by the bronzing-apron D over the entire surface of the sheet; but in most cases this brush 0 is unnecessary, inasmuch as the purpose thereof is acccomplished by said bronzingapron.

The bronze which is removed from the sheet by the wiping-apron G is caught 'in a suitable box placed beneath said apron.

What we claim as new, and desire to secure by Letters Patent, is

1. In a bronzing-machine, the combination, with the single-sheet carrying-cylinder B, of an endless bronzing-apron, D, its supportingrollers E E, and a bronze-fountain F, substantially as described.

2. In a bronzing-machine, the combination of the revolving cylinder B, provided with gripers O, the endless bronzing-apron D, passing around upper and lower rollers E E, and arranged vertically in contact with the cylinder B, the fountain F, in which said bronzing-apron revolves, and the wipingapron G, passing around rollers H H, and arranged beneath the cylinder B, all substantially as herein shown and described.

3. The combination, with the cylinder B, the endless bronzing-apron D, arranged vertically at the side of the cylinder, the fountain F, in which the bronzing-apron revolves,

and the endless revolving wiping-apron G,

arranged horizontally beneath the cylinder, of the spring pressure-roller K, arranged at the side and bearing upon thesurface of the cylinder, substantially as and for the purposes described.

4. The sheet-carrying cylinder B, having its periphery constructed with a longitudinal rigid raised ridge, N, in combination with the gripers O, pivoted in the recess a of the cylinder, the said raised ridge serving to turn the sheet away from the cylinder whenvreleased by the gripers, as and for the purpose described.

5. The combination, with the sheet-carrying cylinder B and its ridge N, of a series of strippers or knives, L, when said ridge is provided with openings for the passage of said strippers or knives, substantially as described.

In testimony that we claim the foregoing we have hereunto set our hands this 4th day of April, 1877.

WM. BRAIDWOOD, JOHN BRAIDWOOD. Witnesses:

W. HAUFF,

CHAS. WAHLERS. 

